Is it true when women live together they usually get their period at the same time?

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Pheromones also cause girls and women who live together to menstruate at approximately the same time of the month. Scientists at Penn State believe this is an evolutionary step that was originally developed to prevent inbreeding among families because it is a phenomenon that is seen across the board in rodents and most other animals.

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YES! it is so weird but me and my 2 teen daug’s were always within one day apart! my son & husband were the ones who suffered!!!heehee